/**
 * Copyright (c) 2013-2022, Alibaba Group Holding Limited;
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * </p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.aliyun.polardbx.binlog.daemon.schedule.checker;

import com.aliyun.polardbx.binlog.domain.po.StorageInfo;

/**
 * @author yanfenglin
 */
public class ShowSlaveChecker extends AbstractHealthChecker {
    private static final String QUERY_SLAVE_STATUS = "SHOW SLAVE STATUS";

    public ShowSlaveChecker(StorageInfo storageInfo) {
        super(storageInfo);
    }

    @Override
    public long doCheck() {
        delay = connection.query(QUERY_SLAVE_STATUS, rs -> {
            while (rs.next()) {
                return rs.getLong("Seconds_Behind_Master");
            }
            return 0L;
        });
        return delay;
    }

}
